Compressor not Starting

[atc53091]

Hey I’m new here an looking for a little advice. I am working on ge monogram refrigerator model zfsb23drg ss serial dl443571. The unit is not cooling at all. Unit  has 120v to it an the inverter board has 120v to it. I am receiving 7.9 v dc from the control board to the inverter. I Have put a new inverter board on because I thought that was the problem. Still not running. Ohm compressor it reads 9 ohms between each leg. Where do I go from here.

Thanks Andrew 

[darren412]

you should be getting I believe a pulsing 4-6 vdc going to the inverter from the mother board with the wires connected. I am not posative but if your getting 7.9 vdc with the wires connected it still should run the compresor   Did you check the wiring from the j15  connectoer to the inverter board and make sure the wires are not broken anywhere  and cutting out the compressor.  Also its variable speeds so the compressor can almost sound silent  even when its running.

[Vance R]

Check each pin to ground on the compressor, should be infinity on all three pins. If it starts at low speed it can be hard to tell if it is running.

[atc53091]

Thanks for response. I have checked all three to ground all open. Running 0 Amps out of the inverter. I was reading it needs a 4-6 dc volt input an 10-12 volt is board is unhooked. But weather or not I have inverter plugged in I get a 7.9 dc volt from j15 pin. Is this indicating a bad control board.

[darren412]

do your checks while the J15 connecter harness is still plugged in at both ends and you should be getting a 4-6 vdc pulsed.   If your not I would say you have a bad control board.  You already replaced the inverter so that is out of the equation as long as the inverter is good.    If your sure the compressor was not posatively running and was room temperature to the touch Then it is most likely a bad control board.  If the compressor was running then you have a seperate issue with the sealed system I would say.   This is all based on you doing the diagnostic checks Properly ?

[Vance R]

Generally if you have a bad compressor the inverter will try to start the compressor. You should have some current for a moment in the start process.  If no start up attempt then main board is next logical suspect.